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  <title>Random number</title>
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  <div id="layout-content"><div id="function.gmp-random-bits" class="refentry">
 <div class="refnamediv">
  <h1 class="refname">gmp_random_bits</h1>
  <p class="verinfo">(PHP 5 &gt;= 5.6.3, PHP 7)</p><p class="refpurpose"><span class="refname">gmp_random_bits</span> &mdash; <span class="dc-title">Random number</span></p>

 </div>
 
 <div class="refsect1 description" id="refsect1-function.gmp-random-bits-description">
  <h3 class="title">说明</h3>
  <div class="methodsynopsis dc-description">
   <span class="methodname"><strong>gmp_random_bits</strong></span>
    ( <span class="methodparam"><span class="type">int</span> <code class="parameter">$bits</code></span>
   ) : <span class="type"><a href="class.gmp.html" class="type GMP">GMP</a></span></div>

  <p class="para rdfs-comment">
   Generate a random number. The number will be between
   0 and (2 ** <code class="parameter">bits</code>) - 1.
  </p>
  <p class="para">
   <code class="parameter">bits</code> must greater than 0, and the maximum value is restricted by available memory.
  </p>
 </div>


 <div class="refsect1 parameters" id="refsect1-function.gmp-random-bits-parameters">
  <h3 class="title">参数</h3>
  <p class="para">
   <dl>

    
     <dt>
<code class="parameter">bits</code></dt>

     <dd>

      <p class="para">
       The number of bits.
      </p>
      <p class="para">可以是一个 GMP
数据 <span class="type"><span class="type resouce">resouce</span></span>，或一个可以转换为数值的字符串。</p> 
     </dd>

    
   </dl>

  </p>
 </div>


 <div class="refsect1 returnvalues" id="refsect1-function.gmp-random-bits-returnvalues">
  <h3 class="title">返回值</h3>
  <p class="para">
   A random GMP number.
  </p>
 </div>


 <div class="refsect1 examples" id="refsect1-function.gmp-random-bits-examples">
  <h3 class="title">范例</h3>
  <p class="para">
   <div class="example" id="example-4093">
    <p><strong>Example #1 <span class="function"><strong>gmp_random_bits()</strong></span> example</strong></p>
    <div class="example-contents">
<div class="phpcode"><pre><span style="color: #000000">
<span style="color: #0000BB">&lt;?php<br />$rand1&nbsp;</span><span style="color: #007700">=&nbsp;</span><span style="color: #0000BB">gmp_random_bits</span><span style="color: #007700">(</span><span style="color: #0000BB">3</span><span style="color: #007700">);&nbsp;</span><span style="color: #FF8000">//&nbsp;random&nbsp;number&nbsp;from&nbsp;0&nbsp;to&nbsp;7<br /></span><span style="color: #0000BB">$rand2&nbsp;</span><span style="color: #007700">=&nbsp;</span><span style="color: #0000BB">gmp_random_bits</span><span style="color: #007700">(</span><span style="color: #0000BB">5</span><span style="color: #007700">);&nbsp;</span><span style="color: #FF8000">//&nbsp;random&nbsp;number&nbsp;from&nbsp;0&nbsp;to&nbsp;31<br /><br /></span><span style="color: #007700">echo&nbsp;</span><span style="color: #0000BB">gmp_strval</span><span style="color: #007700">(</span><span style="color: #0000BB">$rand1</span><span style="color: #007700">)&nbsp;.&nbsp;</span><span style="color: #DD0000">"\n"</span><span style="color: #007700">;<br />echo&nbsp;</span><span style="color: #0000BB">gmp_strval</span><span style="color: #007700">(</span><span style="color: #0000BB">$rand2</span><span style="color: #007700">)&nbsp;.&nbsp;</span><span style="color: #DD0000">"\n"</span><span style="color: #007700">;<br /></span><span style="color: #0000BB">?&gt;</span>
</span>
</pre></div>
    </div>

    <div class="example-contents"><p>以上例程会输出：</p></div>
    <div class="example-contents screen">
<div class="cdata"><pre>
3
15
</pre></div>
    </div>
   </div>
  </p>
 </div>


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